Generate dynamic images for actions

[danmt]

It would be great to have dynamic images in the Hats example so it generates a unique image for the action. The Hats example at the moment shows the hat, it would be nice if the image included things like the price. Also, in the future, we want to add categories (sport, team, etc) and show them in the image.

Source values:

• Sport: Basket - NBA.
• Team: New York Knicks.
• Price: 20

Source image:

Generated image:

[danmt]

After looking through the spec, it turns out the image has to be uploaded somewhere as the action metadata expects the image to be a URL. This would break the idea of generating these images on-demand, instead, we're going to generate the images manually and associate them with each hat so we can wrap this up and focus on more important issues.

[danmt]

If you happen to make any progress on this @SergioRibera we can still use it to generate the images outside of the project and manually add them to the example.